Psalms 103:17 Kabbalah

וְחֶ֤סֶד יְהוָ֨ה ׀ מֵעוֹלָ֣ם וְעַד־ע֭וֹלָם עַל־יְרֵאָ֑יו וְ֝צִדְקָת֗וֹ לִבְנֵ֥י בָנִֽים׃

But the mercy of the LORD is from everlasting to everlasting upon them that fear Him, And His righteousness unto children's children;

Read kabbalistic (mystical) interpretation of Psalms 103:17: and classical mystical sources.